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CSS

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HTML 

              
                <!-- Done: Add underlines back for Windows High Contrast Mode -->
<!-- To-do: Dump first two experiments -->
<!-- To-do: Use <main> as content container, re-lay-out all -->
<!-- To-do: Adjust styles to not affect nav areas, using :has() and brute force -->
<!-- To-do: Print styles, including URL expansion -->
<!-- To-do: Better :target styles -->
<!-- To-do: Standard comments on colors for faster replace (no pre-processing) -->
<!-- To-do: <small> and small-caps -->
<!-- To-do: Evaluate other generated content hints -->
<!-- To-do: Decide between PDF icon or just text hint -->
<!-- To-do: Browser testing (particularly the line weight, may have to use px) -->

<main>
  <section>
    <div>
      <h2>Default Link Styles</h2>
      <p>
        <a href="nerfherder"><img src="https://2.bp.blogspot.com/-7Cb-oJKZW1U/Tb7EWjVDRzI/AAAAAAAAAdw/Q4UBfWH4s_w/s320/HTML5_Logo_128.png" alt="HTML5 logo"></a>
        Sometimes a link is an image, like this one (probably to the right). But <a name="foo">this is an anchor</a>. <a href="#Anchor">This is a link to an anchor</a>.
      </p>
      <p>
        Sometimes a link appears with an acronym, <a href="nerfherder">like <abbr title="Not Safe for Work">NSFW</abbr></a>.
      </p>
      <p>
        Maybe the link has descenders, like in the <a href="nerfherder">quirky words &ldquo;thingamajiggery piddly</a> bits.&rdquo;
      </p>
      <p>
        Sub-script and super-script get links too, <a href="nerfherder">like H<sub>2</sub>SO<sub>4</sub> and then log<sub>n</sub></a> or <a href="nerfherder">9<sup>th</sup> and 6.022 &times; 10<sup>23</sup></a>.
      </p>
      <p>
        <a href="http://cnn.com">This link takes you off this site</a>, so I'm trying an SVG generated content icon. This is a <a href="foo.pdf">test PDF link</a>.
      </p>
    </div>
    <aside>
      <h2>Block Links</h2>
      <ul>
        <li><a href="nerfherder">like <abbr title="Not Safe for Work">NSFW</abbr></a></li>
        <li><a href="nerfherder">quirky thingamajiggery piddly bits</a></li>
        <li><a href="nerfherder">H<sub>2</sub>SO<sub>4</sub> and then log<sub>n</sub></a></li>
        <li><a href="nerfherder">9<sup>th</sup> and 6.022 &times; 10<sup>23</sup></a></li>
        <li><a href="http://cnn.com">This link takes you away from this site</a></li>
      </ul>
    </aside>
  </section>

  
  
  <section>
    <div>
      <h2>Text Shadow Link Styles (First Pass)</h2>
      <p>
        <a href="nerfherder"><img src="https://2.bp.blogspot.com/-7Cb-oJKZW1U/Tb7EWjVDRzI/AAAAAAAAAdw/Q4UBfWH4s_w/s320/HTML5_Logo_128.png" alt="HTML5 logo"></a>
        Sometimes a link is an image, like this one (probably to the right). But <a name="foo">this is an anchor</a>. <a href="#Anchor">This is a link to an anchor</a>.
      </p>
      <p>
        Sometimes a link appears with an acronym, <a href="nerfherder">like <abbr title="Not Safe for Work">NSFW</abbr></a>.
      </p>
      <p>
        Maybe the link has descenders, like in the <a href="nerfherder">quirky words &ldquo;thingamajiggery piddly</a> bits.&rdquo;
      </p>
      <p>
        Sub-script and super-script get links too, <a href="nerfherder">like H<sub>2</sub>SO<sub>4</sub> and then log<sub>n</sub></a> or <a href="nerfherder">9<sup>th</sup> and 6.022 &times; 10<sup>23</sup></a>.
      </p>
      <p>
        <a href="http://cnn.com">This link takes you off this site</a>, so I'm trying an SVG generated content icon. This is a <a href="foo.pdf">test PDF link</a>.
      </p>
    </div>
    <aside>
      <h2>Block Links</h2>
      <ul>
        <li><a href="nerfherder">like <abbr title="Not Safe for Work">NSFW</abbr></a></li>
        <li><a href="nerfherder">quirky thingamajiggery piddly bits</a></li>
        <li><a href="nerfherder">H<sub>2</sub>SO<sub>4</sub> and then log<sub>n</sub></a></li>
        <li><a href="nerfherder">9<sup>th</sup> and 6.022 &times; 10<sup>23</sup></a></li>
        <li><a href="http://cnn.com">This link takes you away from this site</a></li>
      </ul>
    </aside>
  </section>


  
  <section>
    <div>
      <h2> Simpler Text Shadow Link Styles</h2>
      <p>
        <a href="nerfherder"><img src="https://2.bp.blogspot.com/-7Cb-oJKZW1U/Tb7EWjVDRzI/AAAAAAAAAdw/Q4UBfWH4s_w/s320/HTML5_Logo_128.png" alt="HTML5 logo"></a>
        Sometimes a link is an image, like this one (probably to the right). But <a name="foo">this is an anchor</a>. <a href="#Anchor">This is a link to an anchor</a>.
      </p>
      <p>
        Sometimes a link appears with an acronym, <a href="nerfherder">like <abbr title="Not Safe for Work">NSFW</abbr></a>.
      </p>
      <p>
        Maybe the link has descenders, like in the <a href="nerfherder">quirky words &ldquo;thingamajiggery piddly</a> bits.&rdquo;
      </p>
      <p>
        Sub-script and super-script get links too, <a href="nerfherder">like H<sub>2</sub>SO<sub>4</sub> and then log<sub>n</sub></a> or <a href="nerfherder">9<sup>th</sup> and 6.022 &times; 10<sup>23</sup></a>.
      </p>
      <p>
        <a href="http://cnn.com">This link takes you off this site</a>, so I'm trying an SVG generated content icon. This is a <a href="foo.pdf">test PDF link</a>.
      </p>
    </div>
    <aside>
      <h2>Block Links</h2>
      <ul>
        <li><a href="nerfherder">like <abbr title="Not Safe for Work">NSFW</abbr></a></li>
        <li><a href="nerfherder">quirky thingamajiggery piddly bits</a></li>
        <li><a href="nerfherder">H<sub>2</sub>SO<sub>4</sub> and then log<sub>n</sub></a></li>
        <li><a href="nerfherder">9<sup>th</sup> and 6.022 &times; 10<sup>23</sup></a></li>
        <li><a href="http://cnn.com">This link takes you away from this site</a></li>
      </ul>
    </aside>
  </section>
  
  
  <p id="Anchor">
    Demo anchor to test <code>:target</code> styles.
  </p>
</main>
!

CSS 

              
                /* To-Do: Remove text-shadow on select */

@import url(https://fonts.googleapis.com/css?family=Oswald);
@import url(https://fonts.googleapis.com/css?family=Merriweather:400,700,700italic,400italic);

body {
  background-color: #6D695C;
  background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAMAAAAoLQ9TAAAACVBMVEUAAAAAAAAAAACDY+nAAAAAA3RSTlMmDQBzGIDBAAAAG0lEQVR42uXIIQEAAADCMHj/0NdkQMws0HEeAqvwAUGJthrXAAAAAElFTkSuQmCC);
  font-size: 100%;
  font-family: 'Merriweather', serif;
  line-height: 1.4;
}

main, section, aside, div {
  display: block;
  box-sizing: border-box;
}

main > section {
  background-color: #fff;
  padding: .5em 1em;
  background-image: linear-gradient(to right, #fff 0, #fff 69%, #ddd 69%, #ddd);
  margin-bottom: 1em;
}

h1, h2, h3, h4, h5, h6 {
  font-family: 'Oswald', sans-serif;
  font-weight: 400;
}

section img {
  float: right;
}

section::after {
  content: "";
  display: block;
  clear: both;
}

section > div {
  float: left;
  width: 67%;
}

section > aside {
  float: right;
  width: 33%;
  padding: 0 0 1em 1em;
  font-family: 'Oswald', sans-serif;
}

aside h2 {
  padding: 0 .6em;
}

aside ul {
  margin: 0;
  padding: 0;
  list-style-type: none;
}

aside a[href] {
  display: block;
  margin: 1em 0;
  padding: 0 1em;
}

sup, sub {
  font-size: 75%;
  line-height: 0;
}

abbr[title], acronym[title] {
  border-bottom: 0.1em dotted rgba(0,0,0,.3);
  cursor: help;
}

a[href] abbr[title], a[href] acronym[title] {
  cursor: inherit;
}

a[href] {
  color: #00c;
}

a[href]:hover, a[href]:focus {
  color: #c00;
}

aside a[href] {
  color: #c00;
}

aside a[href]:hover, aside a[href]:focus {
  color: #00c;
}

/* Reverse-engineered from https://eager.io/blog/smarter-link-underlines/ */

main section:nth-child(2) a[href] {
  text-decoration: none;
  text-shadow: 0.03em 0 rgb(255,255,255), -0.03em 0 rgb(255,255,255), 0 0.03em rgb(255,255,255), 0 -0.03em rgb(255,255,255), 0.06em 0 rgb(255,255,255), -0.06em 0 rgb(255,255,255), 0.09em 0 rgb(255,255,255), -0.09em 0 rgb(255,255,255), 0.12em 0 rgb(255,255,255), -0.12em 0 rgb(255,255,255), 0.15em 0 rgb(255,255,255), -0.15em 0 rgb(255,255,255);
  background-image: linear-gradient(rgb(255,255,255), rgb(255,255,255)), linear-gradient(rgb(255,255,255), rgb(255,255,255)), linear-gradient(rgb(24, 27, 67), rgb(24, 27, 67));
  background-size: 0.05em 1px, 0.05em 1px, 1px 1px;
  background-repeat: no-repeat, no-repeat, repeat-x;
  background-position: 0% 89%, 100% 89%, 0% 89%;*/
}

main section:nth-child(2) aside a[href] {
  text-shadow: 0.03em 0 #ddd, -0.03em 0 #ddd, 0 0.03em #ddd, 0 -0.03em #ddd, 0.06em 0 #ddd, -0.06em 0 #ddd, 0.09em 0 #ddd, -0.09em 0 #ddd, 0.12em 0 #ddd, -0.12em 0 #ddd, 0.15em 0 #ddd, -0.15em 0 #ddd;
}

/* Fewer shadows, use currentColor */

main section:nth-child(3) a[href] {
  text-decoration: none;
  text-shadow: .07em 0 0 #fff, -.07em 0 0 #fff, 0 .05em 0 #fff;
  background-image: linear-gradient(to right, currentColor 0%, currentColor 100%);
  background-repeat: repeat-x;
  background-position: 0 93%;
  -webkit-background-size: 100% .07em;
  background-size: 100% .07em;
}

main section:nth-child(3) aside a[href] {
  text-shadow: .07em 0 0 #ddd, -.07em 0 0 #ddd, 0 .05em 0 #ddd;
}

main section:nth-child(3) a[href]::selection, main section:nth-child(3) aside a[href]::selection {
  text-shadow: none;
  /*background: transparent;*/
}

/* Support users of high contrast mode by restoring underlines */
@media screen and (-ms-high-contrast: active) {
  main section:nth-child(2) a[href], main section:nth-child(3) a[href] {
    text-decoration: underline;
  }
}


/* Generated content via SVG icons */

main section:nth-child(3) a[href^="http://"]::after, main section:nth-child(3) a[href^="https://"]::after {
  /*content: url(data:image/svg+xml;base64,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);*/
  /*content: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/2729/href_new-win_ems.svg);*/
  content: "";
  display: inline-block;
  height: .5em;
  width: .75em;
  margin-left: .2em;
  /*border: 1px dotted #f00;*/
  background-image: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/2729/href_new-win.svg);
  background-position: 0 100%;
  background-repeat: no-repeat;
  background-size: contain;
}

main section:nth-child(3) a[href^="http://"]::after, main section:nth-child(3) a[href^="https://"]::after, main section:nth-child(3) a[href^="http://"]::after path, main section:nth-child(3) a[href^="https://"]::after path {
  fill: #f00;
}

.SVGnewwin {
  height: .75em;
  width: auto;
  fill: #f00;
}

.SVGnewwin path {
  fill: #f00;
}

main section:nth-child(3) a[href$=".pdf"]::after {
  content: " (PDF)";
  /*display: inline-block;
  height: .75em;
  width: 1em;
  margin-left: .2em;
  background-position: 0 100%;
  background-repeat: no-repeat;
  background-size: contain;
  background-image: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/2729/pdf.svg); */
}

/* Style an anchor when it has been navigated to */

@keyframes Target {
	from { background-color: rgba(255, 242, 0, 1); }
	to { background-color: rgba(255, 242, 0, 0); }
}

@-webkit-keyframes Target {
  from { background-color: rgba(255, 242, 0, 1); }
	to { background-color: rgba(255, 242, 0, 0); }
}

:target {
  /*background-color: rgba(255, 242, 0, 1);*/
  -webkit-animation: Target 1s ease-out 1;
  animation: Target 1s ease-out 1;
}

/* Just in case I need it, since it has slightly better support than the Subject of a selector with Child combinator (E! > F) rule (none) */

a[href]:has( > img)) {
  background-image: none;
  /*border: 3px dotted #f00;*/
}
!

JS
!
999px

Console